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- Question
Sample retention in the column is measured by
Options- A. retention time
- B. retention factor
- C. retention index
- D. all of these
- Correct Answer
- all of these
- 1. What does the retention factor, k', describe?
Options- A. The distribution of an analyte between the stationary and the mobile phase
- B. The migration rate of an analyte through a column
- C. The velocity of the mobile phase
- D. All of these Discuss
- 2. Which of the statements is correct?
Options- A. Gas chromatography is used to analyse gases
- B. Gas chromatography is used to analyse solids
- C. Gas chromatography is used to analyse gases, solutions and solids
- D. All of the above Discuss
- 3. The GC trace obtained after an experiment is called a
Options- A. chromatograph
- B. chromatogram
- C. chromatophore
- D. graph Discuss
- 4. What useful information can be found from a Van Deemter plot?
Options- A. The selectivity factor
- B. Optimum mobile phase flow rate
- C. Optimum column temperature
- D. Optimum column length Discuss
- 5. Split injection is carried out by
Options- A. splitting the sample into smaller portions to inject sequentially
- B. splitting the sample into smaller portions to inject at the same time through parallel ports
- C. splitting off some of the sample so that it does not enter the column
- D. none of the above Discuss
- 6. Sample injection is considered successful if
Options- A. all of the sample in the injector has been added to the column
- B. the sample is concentrated at the start of the column
- C. the sample is spread evenly along the column
- D. the sample is homogenously spread along the column Discuss
- 7. What are the benefits of decreasing the column internal diameter?
Options- A. Increased sample capacity
- B. Increased resolution
- C. Reduced risk of column overloading
- D. All of the above Discuss
- 8. Derivatisation of a sample is carried out to
Options- A. reduce polarity of the analytes
- B. increase the detector response
- C. increase volatility of the analytes
- D. all of the above Discuss
- 9. In column switching chromatography
Options- A. compounds trapped on one column are eluted to another column
- B. one column is removed and replaced by another
- C. the flow to the column is switched on and off repeatedly
- D. any of the above Discuss
- 10. Resolution is proportional to the
Options- A. number of theoretical plates in a column
- B. square root of the number of theoretical plates in a column
- C. square of the number of theoretical plates in a column
- D. cube root of the number of theoretical plates in a column Discuss
Gas Chromatography problems
Search Results
Correct Answer: The migration rate of an analyte through a column
Correct Answer: All of the above
Correct Answer: chromatogram
Correct Answer: Optimum mobile phase flow rate
Correct Answer: splitting off some of the sample so that it does not enter the column
Correct Answer: the sample is concentrated at the start of the column
Correct Answer: Increased resolution
Correct Answer: all of the above
Correct Answer: compounds trapped on one column are eluted to another column
Correct Answer: square root of the number of theoretical plates in a column
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